Schematic Momentum Flow
The illustration below may be associated with "fig. 13" from Oort & Peixoto (1983). The O&P (1983) chart is a zonal cross section, as is the simplified chart below. The streamlines in O&P's figure nicely show the westerly angular momentum source in the subtropics, transport poleward, followed by the sink in the middle latitudes. Their chart shows a streamfunction calculated from the zonal momentum equation without the meridional transport of planetary angular momentum by [v]. (i.e. without the Omega[v] term). The result is to keep the [u][v], [u][omega], the eddy fluxes, and the friction.
The eight "steps" in the momentum cycle listed above are identified by numbers on the chart below. Crudely drawn arrows show the same direction of momentum transport in the chart below.
Note: this table may not display properly in the microsoft internet explorer browser. I plan to produce an image file someday...
The 8 steps:
||||< -- 5 --||<- 5 -||< -- 3 --||||
||||-- 6 -- >||4||/\||||
|NP||60||30 <-- latitude||EQ|